.backhome, .backtop {
    position: fixed;
    top: 10%;
    right: 3%;
    width: 150px;
    height: 50px;
    background-color: #222;
    font: 700 25px '微软雅黑';
    text-align: center;
    line-height: 50px;
    border-radius: 25px;
    color: #fff;
    opacity: 0.8;
}

.backhome a {
    color: #fff;
}

.backtop {
    display: none;
    cursor: pointer;
    top: 80%!important;
}